INFORMATION SYSTEMS ANALYSIS AND DESIGN

INFORMATION SYSTEMS ANALYSIS AND DESIGN

Hello everyone today I wanna to say some information about information systems. Nowadays information systems are so important part of everybody. Do you agree with me? I think you agree with me because it is absolutely clear. So now I would like to describe some aspects of information systems. Firstly, I want to tell you about basic types of information systems.

Over the last several decades the management of information and, thus, of computers and information systems has become increasingly more important to the attainment of an organization’s goals. Information is the life-blood of an organization. Most activities performed by managers in an organization such as problem identification and solution, control, and decision-making are based on information. Most organizations change as a result of both internal and external influences. Computers and information systems provide the means to gather and manage the appropriate information to keep pace with change.

One useful way to represent how an organization can employ information systems technology is to think in terms of three basic kinds of information systems: transaction processing, management information, and decision support systems. The data for these systems are organized into well-defined collections of data called files or databases.

A transaction processing system captures the data necessary to update existing records whenever stored data about the fundamental business operations of the organization must be changed. The transaction processing system edits all input to ensure that it is accurate and complete.

A management information system accepts valid transactions from transaction processing system to update the contents of the database. The management information system can draw the data from the database and process it to provide management with information. It can be used to identify opportunities for improvement or to help determine alternative courses of action.

Now I would like to tell you some information about two phases of System Development Life Cycle such as IMPLEMENTATION phase and MAINTENANCE phase.

During the Implementation phase of the SDLC, the project team supervises the tasks necessary to construct the new information system. The tasks that take place during the implementation phase can include: purchase and install hardware and/or software, create applications, test applications, finalize documentation, train users, convert data, convert to new system. The Maintenance phase is the last and the longest SDLC phase and it lasts until the system is retired. It involves day-to-day operation of the system, making modifications to improve performance, and correcting problems. Three key concepts ensure good quality of maintenance service: reliability, availability, and serviceability.